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Answer for the clue "All used in making synthetic rubbers ", 6 letters:
butene

Alternative clues for the word butene

Word definitions for butene in dictionaries

Wikipedia Word definitions in Wikipedia
Butene , also known as butylene , is an alkene with the formula C H . It is a colourless gas that is present in crude oil as a minor constituent in quantities that are too small for viable extraction. It is therefore obtained by catalytic cracking of long-chain ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
butene \butene\ n. any of three isomeric singly unsaturated hydrocarbons C4H8 ; all are used in making synthetic rubbers; -- called also butylene .

Wiktionary Word definitions in Wiktionary
n. (context chemistry English) Any of several forms of butylene.